James scull



(No Model.)

J. SCULL.

MAOHINE FOR MAKING GREEN SAND GOBES.

No. 297,172. Patented Apr. 22, 1884.

68. 1 A I w g/ l z a m 1 N. PETERS MO-L'rthowher. Washington. D, C.

' Nrrnn TATES ATENT @rrron.

JAMES SGULL, OF JERSEY CITY, NEW JERSEY, ASSIGNOR OF ONE-HALF TO 7 SAMUEL VANCE, OF SAME PLACE.

MACHINE FOR MAKING GREEN-SAND CORES.

SPECIFICATION forming part of Letters Patent N0. 297,172, dated April 22, 1884. Application filed February 21, 1884. (No model.)

If aZZ whom it may concern;

Be it known that I, J AMES SoULL, a citizen of the United States, residing at Jersey City, in the county of Hudson and State of New Jersey, have invented certain new and useful Improvements in Machines for Making Green- Sand Cores, of which the following is a specification.

My invention has for its object to form solid,

hard, and durable sandccores for casting, and

to effect the construction thereof with rapidity; and my invention consists, in combination with a revolving mandrel, of devices for throwing the green sand with great force upon a revolving mandrel, so as to pack the same thereon so firmly as to secure a core of the desired hardness and durability.

In the drawings, Figure 1 is a sectional elevation of a machine by which the cores are manufactured. Fig. 2 is a plan view, the

hopper removed.

The solid orhollow perforated mandrel F turns in suitable bearings above a sand-box, J, and is revolved by means of a handle, a,

opposite the end of a flat plate or "tube, E, equal in width to the length-of the mandrel, and extending from a wind-box, G, into which ablast of air is forced through a tube, L, by means of the fan M, or other suitable blowing 3o apparatus.

Above the tube or Wind-box is'a hopper, D, which communicates with the tube through a narrow opening, 00, at the bottom, regulated by a slide or valve, or, and above the hopper 3 5 revolves a riddle, G, into which the green sand is pnt,and through which it is sifted into the hopper. The sand falls from the hopper in a regular thin stream and is struck by the rapid current of air forced forward by the 40 blower, and is carried with great force against the sides of the mandrel and densely packed thereon as the same is revolved, a knife, A,

trimming down excrescences until the core is of the proper size.

I am aware that cores have been formed by dropping the sand upon a revolving mandrel; but this means of projecting the sand does not pack it upon the mandrel with sufficient density to form a core as hard and durable as is required for many purposes, but an air-blast projects the sand with such force upon the mandrelas to form a hard, solid coating, better capable of withstanding the pressure of the molten metal than a core built up by hand in the usual manner.

The use of the riddle G prevents the introduction into the opening a; or tube E of large pieces which might obstruct the same and interfere with the formation of the core, and also separates the particles, so that they are carried by the air-blast Without contact with the tube or plate E, and thereby prevented from adhering thereto. The riddleis revolved from a shaft, (1, by means of abelt and pulley, and a hammer, H, is lifted .by arms 2 to fall on and strike the riddle at regular intervals, so as to loosen the sand from the sieves, preventing the latter from becoming clogged up.

To regulate the force of the air-current, the box 0' is provided with an opening covered by a slide, 1), which maybe moved to a greater or less extent to permit the escape of a portion of the air, and thereby reduce the pressure in the box.

It will be obvious that the air-passage may be supplied with sand by feeding it in any other manner than that described that will secure the introduction of small quantities across the whole width of the passage in a regular manner. 7

I do not here claim the process of packing sand in cores, herein set forth, as the same constitutes the subject of a separate application.

WVithout therefore limiting myself to the precise construction and arrangement of parts described,

I claim 1. The combination, in.a core-making machine, of a mandrel and means for turning the same, a tube arranged with its end opposite the mandrel and communicating with a blowing apparatus, and means, substantially as described,for feeding green sand regularly into the tube, substantially as set forth.

.2. The combination of the mandrel, tube communicating with the blowing apparatus, and hammer arranged to strike the riddle at IO and hopper arranged above and eonnnunioatintervals, substantially as specified.

ing with the tube, substantially as specified. In testimony whereol'Ihave signed my name The combination of the mandrel, tube, to this specification in the presence of two subblowing apparatus, hopper, and riddle arscribing Witnesses.

ranged above the hopper, for the purpose set J AMES SGULL. forth. Witnesses:

at. The combination, with the mandrel, XVM. H. VANCE,

blowing apparatus, and hopper, of a riddle l EDWARD BLANOIIARD. 

